CN1374845A - Ultrasonic transmitter/receiver by pulse compression - Google Patents
Ultrasonic transmitter/receiver by pulse compression Download PDFInfo
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- CN1374845A CN1374845A CN00813104A CN00813104A CN1374845A CN 1374845 A CN1374845 A CN 1374845A CN 00813104 A CN00813104 A CN 00813104A CN 00813104 A CN00813104 A CN 00813104A CN 1374845 A CN1374845 A CN 1374845A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/06—Measuring blood flow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4272—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue
- A61B8/4281—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue characterised by sound-transmitting media or devices for coupling the transducer to the tissue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2462—Probes with waveguides, e.g. SAW devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2468—Probes with delay lines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
- G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8959—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using coded signals for correlation purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8959—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using coded signals for correlation purposes
- G01S15/8961—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using coded signals for correlation purposes using pulse compression
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/017—Doppler techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/101—Number of transducers one transducer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8979—Combined Doppler and pulse-echo imaging systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52046—Techniques for image enhancement involving transmitter or receiver
- G01S7/52047—Techniques for image enhancement involving transmitter or receiver for elimination of side lobes or of grating lobes; for increasing resolving power
Abstract
A quartz rod (20) is used which has a diameter of 0.58 mm at the end where, for example, an ultrasonic probe is stuck, a diameter of 0.3 mm at the thinnest portion, and a diameter of 0.68 mm at the end on the sample side, as shown in Figure 2(a) and having a length of 38 cm. The diameter on the end of a fused quartz rod (20) where an ultrasonic transducer (10) is attached is determined so as to be in a range in which the conversion efficiency of the L(0,3) mode is high, the diameter of the quartz rod (20) on the end in contact with a sample (50) is determined so as to be much larger than the wavelength, and the diameters of the other portions are determined so as to be so small that the rod is flexible. The transmitted and received waveforms are shown in Figure 2(b).
Description
Technical field
The present invention relates to ultrasonic transmission/reception in medical domain and the ultrasonic measurement field, that in ultrasonic measurement and image conversion etc., use, particularly relate to ultrasonic transmission/reception based on pulse compression.
Background technology
Just used hyperacoustic echo etc. to measure or obtain image very early.For example, in diagnostic ultrasound equipment, send bow wave, receive the reflection echo of ex vivo, obtain intravital faultage image by Flame Image Process from ultrasonic oscillator.In such diagnostic ultrasound equipment, require dark as far as possible degree of reaching deeply and high-resolution.
As the technology that satisfies this requirement pulse compression technique is arranged.This is to implement FM modulation (below, this signal is called the scanning frequency pulse signal) on the ultrasonic signal that sends, making it by the wave filter corresponding to the scanning frequency pulse signal when receiving, the very long pulse compression of script for very short.And, seek to improve the S/N ratio when improving resolution by compression, improve degree of reaching deeply.
In such pulse compression, send signal and received signal in order to separate in time, need be separating between determination object thing and the transducer.Zone between it is called the Disengagement zone.For example, in ultrasonic microscope, the circuit with fully big diameter of comparing with wavelength is used as delay media, as the Disengagement zone.Therefore this circuit does not have pliability owing to can be infinitely-great diameter, can not be thought of as waveguide line.Here the distribution of amplitudes that so-called waveguide line refers in the section does not become with transmission range.In this case, in the 20MHz frequency band, in fact be difficult to receive and dispatch the pulse of the longer duration of 100 μ more than second.In addition, because this circuit do not have pliability, therefore can not be useful in the ultrasound wave endoscope etc.Method as an alternative has the method for receiving and dispatching different probes of using.In addition, when the 25MHz frequency band is above, use the circulator.But, in this case, because the reflection that produces that do not match of transducer and transmission medium will be blended in the receiving system.
Pulse compression sends energy to increase under the restriction that sends peak power, increasing detection range or seeking high-resolution is purpose, is widely used in radar or the sonar field.In the medical ultrasound field,, carried out the research of a large amount of importing pulse compression techniques in order to reach same purpose.In this pulse compression technique, owing to can in time domain, operate the frequency spectrum that sends signal, so have the advantage of the resolution that can improve the specific region etc., however, but also do not reach the degree of practicability in the medical ultrasonic field.
For the maximum problem that realizes practicability is to need the Disengagement zone, the 2nd problem is the Sidelobe Suppression after the pulse compression.The problem in back is to come the signal of reflector from childhood owing to come the signal secondary lobe of arrogant reflection to bury.
If the problem of relevant Disengagement zone is described, then in pulse compression technique, reach hundreds of μ second owing to send the pulse width of pulse signal, so the Disengagement zone becomes big.For this zone is set, use flexible plastic plate usually.This method is very difficult to handle actually.In addition, this method can not be useful in ultrasound wave endoscope etc.As other method of avoiding this method, use the probe of receiving and dispatching respectively.If but use the probe of receiving and dispatching respectively, but then only can detect from ultrasonic beam of sending and the signal that receives with the cross one another scope in receiving area of transducer, resulting picture quality neither be fine.Mixes with received signal in the reception under the state that exists sending signal in addition, owing to needing the great amplifier of dynamic range, so unactual.Thereby, wish to use and separate the method that sends signal and received signal by the probe of receiving and dispatching simultaneously.
Problem of the present invention is to solve the following problem in the past the ultrasonic transmission/reception.
1. in pulse compression, use single transducer, can not separate the transmission signal and the received signal of longer duration in time.
2. the inhibition of the sidelobe level after the compression is also insufficient.
If develop these methods, then all application such as the detection of extremely faint signal or Doppler measurement become possibility.
Summary of the invention
In order to achieve the above object, the present invention is at the time dependent signal of ultrasonic signal frequency of utilization as transmission, carry out in the ultrasonic receiving device of pulse compression for the ultrasonic signal that receives, be characterised in that by the shared transducer of the above-mentioned ultrasonic signal of transmitting-receiving and the shared transmission line of the above-mentioned ultrasonic signal of transmission and constitute, use transmission line as above-mentioned transmission line, above-mentioned transmission line is used as delay medium separates the ultrasonic signal of transmission and the ultrasonic signal of reception in time with flexual waveguide line type.According to this structure, can separate the transmission signal and the received signal of longer duration in time.As this transmission line, can use the thin quartz pushrod of middle body.
As the ultrasonic signal of above-mentioned transmission, can frequency of utilization and the signal that disproportionately changes of time.In this case, the above-mentioned signal of transmission is to become the such signal of signal that frequency and time change pro rata when receiving.If transmit line length then the scanning frequency pulse distorted signals of frequency change, and, then can suppress the distortion in the received signal by the nonlinear scanning frequency pulse signal that frequency of utilization and time disproportionately change.
The ultrasonic signal pulse compression that receives after, and then the dependency of the desired compression waveform when getting with pulse compression can carry out the inhibition of secondary lobe.
By send according to code sequence or not transmission lag a plurality of ultrasonic signals of certain hour, can also send ultrasonic signal coding back, the signal of reception has been carried out pulse compression after, decipher according to the code sequence of having encoded.Like this,, can carry out the secondary compression and handle, can access S/N than high received signal by sending a plurality of scanning frequency pulse signals according to compiling code sequence.
As the ultrasonic signal that sends, use to rise the scanning frequency pulse signal and fall the scanning frequency pulse signal, according to the time difference of above-mentioned each signal of reception being handled the compression pulse that obtains etc. or the analysis of frequency spectrum, can correctly measure Doppler's effect.
In addition, be suitable for the structure of above-mentioned transmitting-receiving, can also constitute and use system in the tube chamber.
Description of drawings
Fig. 1 is the curve that illustrates along the dispersing characteristic of the elastic wave that dissolves the quartz pushrod transmission.
Fig. 2 is used to illustrate separating of the transmission signal that used quartz pushrod and received signal.
Fig. 3 illustrates the situation of having used non-linear scanning frequency pulse signal.
Fig. 4 is used to illustrate Sidelobe Suppression.
Fig. 5 illustrates the emulation of Sidelobe Suppression.
Fig. 6 illustrates the secondary compression.
Fig. 7 illustrates the structure of using system in the tube chamber.
Fig. 8 illustrates the Doppler's effect that rises in the scanning frequency pulse signal.
Fig. 9 illustrates the process of pulse-compression that rises in the scanning frequency pulse signal.
Figure 10 illustrates the result of pulse compression.
Doppler's effect in the scanning frequency pulse signal falls in Figure 11 explanation.
Process of pulse-compression in the scanning frequency pulse signal falls in Figure 12 explanation.
Figure 13 illustrates the result of pulse compression.
Figure 14 illustrates the mensuration of Doppler's effect.
Figure 15 explanation is based on the mensuration example of the Doppler frequency of the interval of compression pulse.
Figure 16 explanation is according to the mensuration example of Frequency spectrum ratio Doppler frequency.
Figure 17 illustrates other structure of using system in the tube chamber.
Figure 18 is based on the waveform observed result of using other structure of system in the tube chamber.
The specific embodiment
Explain with reference to accompanying drawing and to be used to implement optimal morphology of the present invention.
[send signal and received signal in time separate]
At first, hyperacoustic transmission signal and received signal separating in time is described.
In the present invention, be used to isolating Disengagement zone of the time of carrying out and use transmission line with flexual waveguide line type.
As shown in Figure 1, clear and definite L (0, the 1) pattern and the L (0 of the elastic wave of in dissolving quartz pushrod, transmitting [sloping Sha Mageer (Port Star シ ャ マ-Network リ-) ripple], 2) transmission characteristic of pattern or L (0,3) pattern is (with reference to electronic communication association paper magazine, Vol.J69-A, No.8, PP.1006-1014,1986, electric association paper magazine, Vol.109-C, No.8,1989, PP.581-586).In addition, L (0,1) pattern and L (0,2) pattern or L (0,3) pattern refer at the compressional wave in the elastic wave of the rod of Elastic Cylindrical body transmission and along the indeclinable ripple of circumferencial direction.Therefore begin in order from the simplest pattern, be called L (0,1) pattern and L (0,2) pattern or L (0,3) pattern, owing to the difference of transmission time separately can be distinguished.
But owing to use the big zone [B among Fig. 1 or the zone of D] of dispersion [transmission time is different with frequency], the formation pulse compression filter was a purpose in the past, therefore considered to utilize the few zone of dispersion to transmit the scanning frequency pulse signal.Disperse in the zone of A among Fig. 1, C or E to lack, and from the conversion efficiency height (with reference to Japanese Journal of Applied Physics, Vol.27, Supplement 27-1, pp.117-119,1998) of the signal of telecommunication to ultrasonic signal.In the present invention, in dissolving this zone of quartz pushrod, use scope as far as possible widely, signal [rising the scanning frequency pulse signal] that the consideration transmitted frequency rose with the time or frequency are along with the signal [falling the scanning frequency pulse signal] of time decreased.
Here, the E zone of L (0, the 3) pattern of quartz pushrod is used in narration, constitutes to have the method for flexual transmission line.In order to use the E zone of L (0,3) pattern, exciting goes out the ultrasound wave of frequency 20MHz, just needs to use the quartz pushrod about diameter 0.5mm.And then, in order in measuring sample, to send the plane wave (it is desirable to astringent ultrasound wave in sample) that ultrasonic beam is not expanded, must use the transmission line (in 20MHz,, therefore adopting) of comparing and having fully wide cross section with wavelength as the circular end surface about its diameter 0.75mm of 10 times because the hyperacoustic wavelength in the organism approximately is 75 μ m.On the other hand, in order to ensure pliability, must use thin as far as possible transmission line.Therefore in the present invention, use two pluckings, and the taper quartz pushrod that carefully goes down to central smoothing ground.
[taper quartz pushrod]
Under the situation of having used the taper quartz pushrod, owing to used a part and the D zone in C zone, which kind of degree the ratio that therefore must tentatively obtain end face and central part branch allows.The result who tentatively studies for various taper quartz pushrods, shown in Fig. 2 (a), in the present invention, using the end face diameter of for example bonding ultrasound probe one side is 0.58mm, diameter is 0.3mm in the thinnest part, diameter is 0.68mm in the end face of sample one side, and length is the quartz pushrod 20 of 38cm.Like this, the diameter that dissolves ultrasonic transducer 10 1 sides of quartz pushrod 20 is in the good scope of the conversion efficiency of L (0,3) pattern, in addition, the diameter of the quartz pushrod 20 of contact sample 50 1 sides is compared fully big with wavelength, other parts are set for and fully carefully made it possible to obtain pliability.
The influence that can transmit other pattern between in this case, can confirming from 18MHz to 21MHz less and the few ultrasound wave of wave distortion.Send waveform shown in Fig. 2 (b) and receiving waveform.In addition, even can confirm at 29MHz to also carrying out good action between the 33MHz.
[non-linear scanning frequency pulse signal]
Owing in the zone as described above of quartz pushrod 20, also have dispersibility, if therefore become about 1 meter in order to form the needed transmission range in Disengagement zone, wave distortion then.Therefore, need carry out it revises.In the present invention, constitute and utilize the scanning frequency pulse signal in the easy control waveform this point of time domain, be taken as the nonlinear pulse signal that pans [signal that frequency does not change pro rata with the time] sending the scanning frequency pulse signal, the waveform that receives after its characteristic becomes linear frequency sweep pulse signal [signal that frequency and time change pro rata].With Fig. 3 this point is described.
In Fig. 3 (a), the transmission signal that is taken place by signal generator 30 is taken as non-linear scanning frequency pulse signal as described above, this non-linear scanning frequency pulse signal is joined from transducer 10 dissolve on the quartz pushrod 20 as sending signal.Non-linear scanning frequency pulse signal is along dissolving quartz pushrod 20 transmission, in sample 50 reflections, dissolves that quartz pushrod 20 transmit once more and by transducer 10 receptions along same.This received signal is the linear frequency sweep pulse signal.Be shown in Fig. 3 (b) (1) and (2) as the non-linear scanning frequency pulse signal that sends signal with as the waveform of the linear frequency sweep pulse signal of received signal.Preparation method as the non-linear scanning frequency pulse signal that sends signal describes in detail in the back.
Thus, can both transmit rising the scanning frequency pulse signal and also transmit and fall the scanning frequency pulse signal, and can easily remove the signal processing of the influence of the frequency dependence decay in the bio-tissue or Doppler signal detecting etc. along same transmission line.In addition, the transmission time of L (0,3) pattern is as from as shown in Figure 1, because each rice is 180 μ about second, therefore need change the length of above-mentioned transmission line according to the pulse width that sends signal.
[preparation method of non-linear scanning frequency pulse signal]
Preparation method as non-linear scanning frequency pulse signal, the L (0 of the elastic wave that utilization is transmitted in dissolving quartz pushrod [sloping husky mug(unit of measure) that ripple], 3) the E zone of pattern, dissolving an end mounting converter of quartz pushrod, the other end is used as bonder with measured object, the dispersive non-linearity FM signal of revising above-mentioned elastic wave as sending signal, is taken as the linear frequency sweep pulse signal to received signal.
In this case,, the Fourier transform of linear frequency sweep pulse signal is designated as C (ω), then C (ω)/(H (ω)+k) carries out inverse Fourier transform and obtains the non-linear scanning frequency pulse signal of transmission if the transfer function of transmission line is designated as H (ω).Here, k determines for minimum such benchmark according to the difference of two squares of ideal scanning frequency pulse signal and designed scanning frequency pulse signal.
[Sidelobe Suppression]
For example in medical ultrasonic image conversion device, need be positioned near the detection of the little reflector of big reflector.Therefore, in order to improve resolution, in pulse compression, maximum problem is the Sidelobe Suppression of echo.In the present invention for suppressed sidelobes, as shown in Figure 4, in the scanning frequency pulse signal that receives, use pulse compression filter 41 from the waveform compression of measuring thing after, and then fetch from dependency waveform generator 43 and desired compression waveform pulse compression filter 41.Because by getting the phase cross correlation, therefore the output height utilizes this point suppressed sidelobes when two similar waveforms are consistent.
Fig. 5 (a) is the oscillogram of the scanning frequency pulse signal of reception from pulse compression filter 41 outputs, and Fig. 5 (b) is the oscillogram of relevant treatment unit 42 outputs.Suppressed secondary lobe as can be known from these oscillograms.
This method can be useful in radar or the sonar etc.
[secondary compression method]
Corresponding to M series (time serieses of random pulses), make to send, receive non-linear scanning frequency pulse signal by setting for, the horizontal pulse of going forward side by side compression can obtain the signal consistent with the M sequence later, thus, the manner is useful in the coded system such as M sequence.If according to this method, then can carry out the separating of transmission signal and received signal in the coded system, and the M sequence is multiplexing.In addition, owing to become, therefore can obtain very big compression ratio based on the overall compression ratio of this method based on long-pending with based on the compression ratio of M series of the compression ratio of scanning frequency pulse signal.
Use Fig. 6 is described in detail.In the A of Fig. 6 part, the generation that sends signal is shown.That is, produce a plurality of scanning frequency pulse signals respectively postponed certain hour, corresponding to the code of M sequence, for example 1,1,0 ..., send the scanning frequency pulse signal postponed in time.When sending signal, when the M sequence is " 1 ", send the scanning frequency pulse signal, when " 0 ", do not send, after having synthesized in synthesizer 32 according to a plurality of scanning frequency pulse signals of such M sequence, send from transmitter 33.After having received signal with receiver 46, at first carry out the pulse compression of scanning frequency pulse signal, produce pulse train corresponding to the code of M sequence with pulse compression filter 47 from sample.Then, with the consistent signal interpretation of same M sequence when sending of 48 of decoders, can obtain a short pulse.Like this, owing to carry out therefore can carrying out S/N than high mensuration based on the compression of scanning frequency pulse signal with based on the secondary compression of the compression of M sequence.
In addition, above-mentioned Sidelobe Suppression processing is useful in this secondary compression processing, can carries out Sidelobe Suppression later in the processing of pulse compression filter.
Above-mentioned secondary compression can also be useful in radar or sonar and the spread spectrum communication.
[using system's ultrasound wave endoscope system in the tube chamber]
Use Fig. 7 to illustrate in tube chamber with the example that has been suitable for the invention described above in the ultrasound wave endoscope.
With the tube chamber in the blood vessel or in the urinary catheter etc. is object, in the ultrasound wave endoscope of the system that probe is mechanically rotated, and assembling and use ultrasonic transducer 10 in conduit.In this system, use method then to be easy to import pulse compression based on separation transmission signal of the present invention and received signal.
This point shown in Fig. 7.That is, in the 20MHz frequency band, the elastic wave of L (0,3) pattern is owing to transmit in the quartz pushrod of about 0.7mm at the about 0.3mm of diameter, therefore can implement suitable protection such as winding silk and put into quartz pushrod in the metal wire of hollow.Because the quartz pushrod 20 of this degree thickness has pliability, therefore can put in the conduit and use.Coupler section is set the diameter corresponding to the mensuration degree of depth that uses the taper quartz pushrod for.And then, the compatible portion of configure sound (matching layer) 22, the plane of refraction of acoustic wave beam and lens (being the reflecting mirror 24 of band convergence lens in this embodiment).These lens can be positioned at the very near position apart from the determination object sample.The ultrasound wave that is gone out by ultrasonic transducer 10 excitings is through dissolving quartz pushrod 20 and bonder shines the target area, and reflected signal transmission in quartz pushrod 20 on the contrary is transformed to the signal of telecommunication once more by transducer 10.Become the linear frequency sweep pulse signal if set the signal that sends the feasible reception of signal, then received signal is carried out after the pulse compression filtering or A/D conversion of standard, handles being transformed to compression pulse by the standardized digital signal that is undertaken by signal processing unit 44.Can observe this pulse signal with display device 45.
Like this, use nonlinear scanning frequency pulse signal,, can use the Sidelobe Suppression of the desirable output waveform of above-mentioned pulse compression filter to handle perhaps as the processing of received signal as sending signal.
In addition, can also use above-mentioned secondary compression to handle.
[Doppler signal measurement]
If known linear scanning frequency pulse signal is subjected to Doppler displacement, then the shape of compressed signal waveform changes hardly, and frequency spectrum produces frequency displacement.Here, illustrate to utilize in above-mentioned transmission line, to transmit simultaneously and rise the scanning frequency pulse signal and fall the scanning frequency pulse signal, this point from the frequency spectrum of each signal of same regional reflex is passed in the opposite direction compares these frequency spectrums, carries out the situation of Doppler signal detecting.By changing the time rate of change of the frequency that sends the scanning frequency pulse signal, can detect large-scale movement velocity.
At first, use Fig. 8～Figure 13 to explain the Doppler displacement that rises the scanning frequency pulse signal and fall the scanning frequency pulse signal.
Fig. 8～Figure 10 illustrates under the situation that rises the scanning frequency pulse signal, according to having or not Doppler's effect, the situation that the waveform after the compression is offset in time.
At first consider not have the situation of Doppler's effect.Fig. 8 (a) pattern linear FM scanning frequency pulse signal being shown, is that frequency is from f
1To f
2=f
1The scanning frequency pulse signal of the pulse width T that+Δ f increases linearly.This waveform is input in the have Fig. 9 pulse compression filter of characteristic of (a).In this wave filter, big in the regional time delay that frequency is low, along with raising, frequency reduces linearly time delay.In frequency is f
1The time, be t time delay
2, be f in frequency
2The time become t time delay
1=t
2-T.If be input in this wave filter rising the scanning frequency pulse signal, then in time earlier the signal of input gently advance because high signal runs, therefore become the waveform shown in Figure 10 (a) compressing the scanning frequency pulse signal later on by wave filter.At this moment being designated as T from any benchmark time delay constantly
0
Secondly, consider to have the situation of Doppler's effect.Like that, according to Doppler's effect, the scanning frequency pulse signal is subjected to the skew (Doppler displacement) of frequency to scanning frequency pulse signal shown in Fig. 8 (a), becomes from f shown in Fig. 8 (b)
1+ f
dTo f
2+ f
dThe scanning frequency pulse signal that changes.Here, f
1Be according to the frequency change of Doppler's effect, be called Doppler frequency, here just be assumed to be.Situation when the scanning frequency pulse signal that this frequency displacement is shown is input in the pulse compression filter identical with the characteristic shown in Fig. 9 (a) be Fig. 9 (b).As shown in this figure like that, corresponding to frequency f
1+ f
dTime delay be reduced to t
2-τ
dHere, τ
d=Tf
d/ Δ f.Thereby the delay of compressed waveform also reduces, and after wave filter, the scanning frequency pulse signal becomes the waveform shown in Figure 10 (b), and delay constantly becomes T from benchmark
0-τ
d
Secondly, consider to fall the situation of scanning frequency pulse signal.Figure 11～Figure 13 illustrated under the situation of falling the scanning frequency pulse signal, according to having or not Doppler's effect, and the situation of the skew of the waveform after the compression.
At first consider not have the situation of Doppler's effect.Frequency is shown to Figure 11 (a) pattern from f
1To f
1=f
2The scanning frequency pulse signal that-Δ f reduces linearly.If this signal is input in the pulse compression filter of characteristic shown in Figure 12 (a), then in this wave filter for f
2Time delay big, for f
1=f
2The time delay of-Δ f is little, and therefore the high composition of frequency that is input at first in the wave filter slowly advances, and the low composition of frequency of back input runs, and therefore can obtain the compressed waveform shown in Figure 13 (a).At this moment being designated as T from benchmark time delay constantly
0
Secondly consider to have the situation of Doppler's effect.Scanning frequency pulse signal shown in Figure 11 (a) is subjected to frequency deviation according to Doppler's effect, like that, is changed to frequency from f shown in Figure 11 (b)
2+ f
dTo f
1+ f
d=f
2-f
1The scanning frequency pulse signal that+Δ f changes.If this signal is input in the pulse compression filter with Figure 12 (b) identical characteristics, then frequency totally increases, therefore as Figure 12 (b) shown in like that the delay from the benchmark moment of compressed waveform become T
0+ τ
dAfter wave filter, the scanning frequency pulse signal becomes the waveform shown in Figure 12 (b), and delay constantly becomes T from benchmark
0+ τ
d
As shown in Figure 10 and Figure 12, therefore the signal after rising the scanning frequency pulse signal and falling the scanning frequency pulse Signal Compression can carry out the detection of Doppler signal by detecting skew owing to be offset in the opposite direction according to Doppler's effect.
Secondly, illustrate how to detect Doppler signal.The Fourier conversion of the compressed waveform that rises pulsed frequencymodulated signal shown in Figure 10 (a) is designated as F
U(ω).In the signal of Figure 10 (b) with Doppler's effect, the offset THS in time because waveform does not change
d, so the Fourier transform of this waveform becomes F
U(ω) e
J ω τ dEqually, if the Fourier transform as the waveform of Figure 13 that falls the scanning frequency pulse signal (a) is designated as F
D(ω), then the Fourier transform of the signal waveform with Doppler's effect shown in Figure 13 (b) becomes F
D(ω) e
-j ω τ d
Thereby, when not having Doppler's effect, become F if adjustment system for example makes
V(ω)=F
D(ω), then from F
U(ω) e
J ω τ dAnd F
D(ω) e
-j ω τ dMeasured value, can obtain τ
d=Tf
dΔ f is Doppler frequency f
d
In addition, considered to increase the situation of Doppler signal in this explanation, and the direction that just changes becomes on the contrary under situation about reducing, principle does not change.
Use this principle to detect the device of Doppler frequency shown in Figure 14.
In Figure 14, rise scanning frequency pulse signal 1 and fall scanning frequency pulse signal 2 by synthesizer 61 synthetic back transmissions.The signal that sends to sample through transmission line of the present invention is after receiving, and signal 1 takes out the signal of target location by rising scanning frequency pulse with pulse compression system 64 compressions by gate circuit 1 66.Fall scanning frequency pulse signal 2 also by falling scanning frequency pulse, take out the signal of above-mentioned target location by gate circuit 2 67 with pulse compression system 65 compressions.
When the target location of compression pulse is detected, carry out under the situation of Doppler measurement, send the signal of each target location to time comparison circuitry (not shown) from gate circuit 1 66 and gate circuit 2 67.Rising scanning frequency pulse signal 1 and falling in the scanning frequency pulse signal 2, carry out the mensuration of the Doppler's effect in the target location by time comparison circuitry according to time difference for each.The back explains this mensuration.
Under situation about detecting, in convolution integral device 1 68 and convolution integral device 2 69, carry out convolution integral respectively with standard scanning frequency pulse signal (rise scanning frequency pulse signal 1 or fall scanning frequency pulse signal 2) from standard scanning frequency pulse signal generator 70 as the pulse of the output of gate circuit 1 66 and gate circuit 2 67 based on the Doppler frequency of frequency spectrum.Its result because the scanning frequency pulse signal that can obtain having time difference, therefore they be input to multiplied each other in the mixer 71 after, carry out spectrum analysis.If take out low-frequency component thus, then obtain the beat of scanning frequency pulse signal with 2 time differences.Can ask the Doppler frequency in the target location thus.Identical by the characteristic of gate circuit 1 66 AND circuits 2 67 is taken as, the influence that can make window function is for minimum.
Relevant spectrum analysis also at length describes in the back.
In the transmission of the measured signal of this Doppler's effect, can use quartz pushrod shown in Figure 2, but be not limited thereto.
In the transmitting-receiving of these signals, can use above-mentioned non-linear scanning frequency pulse signal etc., perhaps in Sidelobe Suppression, can use the Sidelobe Suppression of the desirable output waveform of above-mentioned pulse compression to handle.
When for example using this method for the blood flow rate detection of organism, by with the ultrasonic contrast agents (isotopic tracer) of low concentration and with can correctly carrying out blood flow detection, in addition, owing to can measure the blood flow in this position in the time of with position finding, therefore can ask the VELOCITY DISTRIBUTION of blood flow.
In Figure 15, the Doppler frequency of being undertaken by the interval of the output pulse of gate circuit among Figure 14 1 and gate circuit 2 is compared is shown measures example.Here, make the carrier deviation that sends the scanning frequency pulse signal in advance, be spaced apart benchmark when not having Doppler's effect, make the increase and decrease of Doppler's effect corresponding with the increase and decrease in pulse spacing.That is, with shown in Figure 15 (b) do not have Doppler's effect the time the interval compare, if Doppler displacement for just, then shown in Figure 15 (a) like that, the expansion of the interval of pulse, if Doppler displacement for negative, then such as Figure 15 (b) shown in, the interval of pulse narrows down.By detecting this interval, the Doppler's effect in the target that can locate.
Doppler frequency of carrying out based on spectrum analysis shown in Figure 16 is measured example.Here, make the carrier deviation that sends the scanning frequency pulse signal in advance, make the increase and decrease of Doppler's effect corresponding with the passing of frequency spectrum.That is, be 0 o'clock in Doppler displacement, shown in Figure 16 (b), the center of frequency spectrum is 10KHz.If Doppler displacement is for just, then shown in Figure 16 (a), middle mind-set low frequency one lateral deviation of frequency spectrum is moved, if Doppler displacement for negative, then shown in Figure 16 (c), middle mind-set high frequency one lateral deviation of frequency spectrum is moved.Skew by detecting can detect the frequency displacement (Doppler frequency) based on Doppler's effect.
[using system in other the tube chamber]
Use Figure 17 to illustrate in tube chamber with being suitable for other example of the present invention in the system.
With the tube chamber in the blood vessel or in the urinary catheter etc. is object, in the ultrasound wave endoscope of the system that probe is mechanically rotated, and assembling and use ultrasonic transducer 10 in conduit.This is identical with the system that uses in Fig. 7.In this system,, therefore use L (0,1) pattern to constitute owing to wish the pliability that transmission line has.
This system shown in Figure 17.That is, in the quartz pushrod of 20MHz frequency band L (0,1) pattern about diameter 125 μ m, transmit.In this experiment, use the front end that dissolves quartz pushrod 20 at the about 60cm of length as the bonding diameter 150 μ m of matching layer 22 (coupling circuit), the quartz pushrod of the dielectric line of length 37 μ m (Stycast 2651mm).Matching layer has the effect as the bonder of transmission line and water.Carry out water-proofing treatment in the metal tube putting into the transmission line of this matching layer.Use the right part of ellipse of revolution as convergence lens 24, so that arrive the fore-end of transmission line in its focal position.In addition, in order in thin circuit, to encourage significantly ultrasound wave,, dissolving quartz pushrod transmitting-receiving ultrasound wave therefore through ultrasound wave parabolic mirror 11 by ultrasonic transducer 10 excitations.These lens can be placed on the position near the sample of tested object.Through dissolving quartz pushrod 20 and bonder shines target area 55, reflected signal transmission in quartz pushrod 20 conversely is transformed to the signal of telecommunication once more by transducer 10 by the ultrasound wave of ultrasonic transducer 10 excitation.Become the linear frequency sweep pulse signal if set the signal that sends the feasible reception of signal, then received signal is transformed into compression pulse by the standardized digital signal processing of being undertaken by signal processing unit 44 after the pulse compression filtering of having carried out standard or A/D conversion.In display device 45, can observe this point.An example of observed waveform shown in Figure 18.
Figure 18 (a) is the example of having observed from the reflection of the aluminium sheet in the water.In back, can clearly observe reflection configuration B from the aluminium sheet in the water from the reflection A that transmits end face.Figure 18 (b) is the example of having observed from the reflection of the acrylic panel in the water, and Figure 18 (c) is an example of having observed the optical fiber that is in 125 μ m φ in the water.Can both observe reflection configuration C, D in back under two kinds of situations from the reflection configuration A that transmits end face from target object.
In this system, can use nonlinear scanning frequency pulse signal as sending signal, as the processing of received signal, can also use the Sidelobe Suppression of the desirable output waveform of above-mentioned pulse compression filter to handle.
In addition, can also use above-mentioned secondary compression to handle.
Among the present invention, in the ultrasonic transmission/reception that uses the scanning frequency pulse signal, use transmission line as transmission line,, can separate transmission signal and received signal in time with certain longer duration by above-mentioned transmission line is used as delay medium with flexual waveguide line type.As this transmission line, can also use quartz pushrod at two ends with taper.
If transmit line length then the scanning frequency pulse distorted signals, and, can suppress the distortion in the received signal by using nonlinear scanning frequency pulse signal.
In addition, by using the desirable output waveform of pulse compression, can carry out the Sidelobe Suppression of received signal.
By sending a plurality of scanning frequency pulse signals according to compiling code sequence, then can carry out the secondary compression and handle, can access S/N than higher received signal.
In addition, rise the scanning frequency pulse signal and fall the scanning frequency pulse signal, can correctly measure Doppler's effect by using.
Claims (9)
1. ultrasonic receiving device, this ultrasonic receiving device are as the ultrasonic signal that sends, and the time dependent signal of frequency of utilization carries out pulse compression for the ultrasonic signal that receives, and it is characterized in that:
Constitute by the shared transducer of the above-mentioned ultrasonic signal of transmitting-receiving and the shared transmission line of the above-mentioned ultrasonic signal of transmission,
Have flexual waveguide line type transmission line as above-mentioned transmission line use, above-mentioned transmission line is used as delay medium separates the ultrasonic signal of transmission and the ultrasonic signal of reception in time.
2. ultrasonic receiving device according to claim 1 is characterized in that:
The signal that disproportionately changes as the ultrasonic signal frequency of utilization of above-mentioned transmission and time, the above-mentioned signal of transmission are to become the such signal of signal that frequency and time change pro rata when receiving.
3. according to the ultrasonic receiving device described in claim 1 or 2, it is characterized in that:
After a ultrasonic signal that receives has been carried out pulse compression, and then the dependency of the desired compression waveform when getting with pulse compression, carry out the inhibition of secondary lobe.
4. according to the ultrasonic receiving device described in each of claim 1～3, it is characterized in that:
By send according to code sequence or not transmission lag a plurality of ultrasonic signals of certain hour, ultrasonic signal coding back is sent,
After the signal that receives had been carried out pulse compression, code sequence was deciphered according to having encoded.
5. according to the ultrasonic receiving device described in each of claim 1～4, it is characterized in that:
As above-mentioned transmission line, use the thin taper quartz pushrod of middle body.
6. ultrasonic receiving device, this ultrasonic receiving device carries out the measurement of Doppler's effect, it is characterized in that:
As the ultrasonic signal that sends, the signal that signal that frequency of utilization increased with the time and frequency reduced with the time,
Detect Doppler signal according to the time difference of above-mentioned each signal that receives being handled the compression pulse that obtains.
7. ultrasonic receiving device, this ultrasonic receiving device carries out the measurement of Doppler's effect, it is characterized in that:
As the ultrasonic signal that sends, the signal that signal that frequency of utilization increased with the time and frequency reduced with the time,
By the compression pulse and the convolution integral of standard scanning frequency pulse signal that obtains after carrying out above-mentioned each signal that receives handled, the line frequency analysis of spectrum of going forward side by side, thereby detection Doppler signal.
8. ultrasonic receiving device, this ultrasonic receiving device carries out the measurement of the Doppler's effect described in claim 6 or 7, it is characterized in that:
As the hyperacoustic ultrasonic receiving device of transmitting-receiving, the ultrasonic receiving device described in each of use claim 1～4.
9. use the ultrasound wave endoscope system in a tube chamber, the ultrasonic receiving device described in each of the interior usefulness of this tube chamber ultrasound wave endoscope system use claim 1～5 is characterized in that:
On the end face of sample one side of above-mentioned transmission line, has matching layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP271454/99 | 1999-09-24 | ||
| JP271454/1999 | 1999-09-24 | ||
| JP27145499 | 1999-09-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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| CN1210003C CN1210003C (en) | 2005-07-13 |
Family
ID=17500266
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00813104XA Expired - Fee Related CN1210003C (en) | 1999-09-24 | 2000-09-25 | Ultrasonic transmitter/receiver by pulse compression |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6730029B1 (en) |
| EP (1) | EP1214910B1 (en) |
| JP (1) | JP4091302B2 (en) |
| KR (1) | KR100626944B1 (en) |
| CN (1) | CN1210003C (en) |
| AU (1) | AU7443800A (en) |
| CA (1) | CA2383515C (en) |
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| WO (1) | WO2001021074A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103099641A (en) * | 2011-11-09 | 2013-05-15 | 株式会社东芝 | Ultrasonic diagnostic system |
| CN105973997A (en) * | 2016-04-28 | 2016-09-28 | 长沙金码高科技实业有限公司 | Ultrasonic transceiver |
| CN109990745A (en) * | 2017-12-27 | 2019-07-09 | 精工爱普生株式会社 | Ultrasonic unit and ultrasonic measuring method |
| CN111537764A (en) * | 2020-05-14 | 2020-08-14 | 南京昊控软件技术有限公司 | Correlation acoustic water flow velocity measuring device |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4192490B2 (en) * | 2002-04-26 | 2008-12-10 | 株式会社日立メディコ | Ultrasonic diagnostic equipment |
| EP1739455A1 (en) * | 2005-06-23 | 2007-01-03 | I.N.S.E.R.M. Institut National de la Sante et de la Recherche Medicale | Chirp reversal ultrasound contrast imaging |
| JP5411417B2 (en) * | 2007-09-11 | 2014-02-12 | 古野電気株式会社 | Pulse signal transmission / reception device and transmission / reception method |
| DE102008027489B4 (en) * | 2008-06-10 | 2010-08-19 | Krohne Ag | Acoustic flow meter |
| JP4962510B2 (en) * | 2009-02-25 | 2012-06-27 | 日本電気株式会社 | Target search signal generation method and target search device |
| JP5355194B2 (en) * | 2009-04-13 | 2013-11-27 | 日立アロカメディカル株式会社 | Ultrasonic diagnostic equipment |
| DE102010039606A1 (en) * | 2010-08-20 | 2012-02-23 | Endress + Hauser Flowtec Ag | Method for operating ultrasonic flow meter for determining volume flow rate and mass flow rate in pipeline in process-and automation engineering, involves superimposing and acoustically rectifying two acoustic signals |
| GB201103642D0 (en) * | 2011-03-03 | 2011-04-13 | Univ Bradford | Methods and systems for detection of liquid surface fluctuations |
| JP5847423B2 (en) * | 2011-04-13 | 2016-01-20 | 古野電気株式会社 | Range sidelobe removal apparatus, signal processing apparatus, radar apparatus equipped with the signal processing apparatus, range sidelobe removal method, and program |
| US10245007B2 (en) | 2013-03-15 | 2019-04-02 | Infraredx, Inc. | High resolution intravascular ultrasound imaging systems and methods |
| US9260963B2 (en) * | 2013-07-03 | 2016-02-16 | Schlumberger Technology Corporation | Acoustic determination of the position of a piston within a sample bottle |
| GB201520388D0 (en) | 2015-11-19 | 2016-01-06 | Rolls Royce Plc | Ultrasonic testing tool |
| JP7127700B2 (en) * | 2018-12-19 | 2022-08-30 | 日本電気株式会社 | Information processing device, wearable device, information processing method, and storage medium |
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| US3815409A (en) * | 1973-02-15 | 1974-06-11 | A Macovski | Focused sonic imaging system |
| JPS58123482A (en) * | 1982-01-18 | 1983-07-22 | Nec Corp | X y coding pulse compression system |
| JPS59225375A (en) * | 1983-06-07 | 1984-12-18 | Nec Corp | Doppler detection circuit |
| JPH01146806U (en) * | 1988-03-30 | 1989-10-11 | ||
| JP2809418B2 (en) * | 1989-01-26 | 1998-10-08 | オリンパス光学工業株式会社 | Ultrasound diagnostic equipment |
| JPH03143432A (en) * | 1989-10-31 | 1991-06-19 | Yokogawa Medical Syst Ltd | Dispersion compression type ultrasonic diagnostic apparatus |
| JPH03162837A (en) * | 1989-11-22 | 1991-07-12 | Yokogawa Medical Syst Ltd | Medical ultrasonic device |
| JPH03288804A (en) * | 1990-04-05 | 1991-12-19 | Matsushita Electric Ind Co Ltd | Infrared optical fiber and production thereof |
| US5224482A (en) * | 1991-04-08 | 1993-07-06 | Kabushiki Kaisha Toshiba | Ultrasound high velocity flow correlation measurement using coded pulses |
-
2000
- 2000-09-25 KR KR1020027003731A patent/KR100626944B1/en not_active IP Right Cessation
- 2000-09-25 CA CA002383515A patent/CA2383515C/en not_active Expired - Fee Related
- 2000-09-25 WO PCT/JP2000/006559 patent/WO2001021074A1/en active IP Right Grant
- 2000-09-25 AU AU74438/00A patent/AU7443800A/en not_active Abandoned
- 2000-09-25 DE DE60020724T patent/DE60020724T2/en not_active Expired - Fee Related
- 2000-09-25 US US10/088,638 patent/US6730029B1/en not_active Expired - Fee Related
- 2000-09-25 JP JP2001524508A patent/JP4091302B2/en not_active Expired - Fee Related
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103099641A (en) * | 2011-11-09 | 2013-05-15 | 株式会社东芝 | Ultrasonic diagnostic system |
| CN105973997A (en) * | 2016-04-28 | 2016-09-28 | 长沙金码高科技实业有限公司 | Ultrasonic transceiver |
| CN109990745A (en) * | 2017-12-27 | 2019-07-09 | 精工爱普生株式会社 | Ultrasonic unit and ultrasonic measuring method |
| CN109990745B (en) * | 2017-12-27 | 2022-04-29 | 精工爱普生株式会社 | Ultrasonic device and ultrasonic measurement method |
| CN111537764A (en) * | 2020-05-14 | 2020-08-14 | 南京昊控软件技术有限公司 | Correlation acoustic water flow velocity measuring device |
| CN111537764B (en) * | 2020-05-14 | 2023-05-12 | 南京昊控软件技术有限公司 | Correlation acoustic water flow velocity measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60020724D1 (en) | 2005-07-14 |
| EP1214910B1 (en) | 2005-06-08 |
| US6730029B1 (en) | 2004-05-04 |
| KR100626944B1 (en) | 2006-09-20 |
| CA2383515A1 (en) | 2001-03-29 |
| CN1210003C (en) | 2005-07-13 |
| DE60020724T2 (en) | 2006-03-16 |
| EP1214910A1 (en) | 2002-06-19 |
| KR20020043588A (en) | 2002-06-10 |
| JP4091302B2 (en) | 2008-05-28 |
| WO2001021074A1 (en) | 2001-03-29 |
| EP1214910A4 (en) | 2004-05-26 |
| AU7443800A (en) | 2001-04-24 |
| CA2383515C (en) | 2006-12-19 |
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